Found Onstar replacement for allroad...conv to bluetooth
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I installed the module myself -- it required removing the glovebox, pulling back the carpet to access the OnStar module and swapping pins from one harness to another (fairly simple with a pin extractor). The BT box can be mounted exactly where the OnStar module was.
Antenna-wise, keep in mind that the purpose of the Bluetooth module is to allow your phone to act as a speakerphone within your car, so it doesn't require any connections to the mast or GPS antenna.
If you buy the box from Lee Hicks, he offers a very clear PDF on how to install it, plus all necessary VAG coding.


